FACT: The inner core of the earth is a sphere with a radius of about 1,200 km, made mostly of iron, which has different mechanical and magnetic properties based on temperature.
MYSTERY: Elastic waves pass that through this core move faster parallel to the earth’s axis of rotation than they do parallel to the equator.
At the high temperatures that prevail in the core of the earth, these waves should pass at the same speed regardless of their direction.
Scientists from Uppsala University and KTH present say they have an explanation for this puzzling characteristic. In 2003, they published a theory that the earth’s core assumes assumes a body-centered cubic crystal structure at high temperatures, providing for high levels of elastic anisotropystructure that, despite its high degree of symmetry, displays a surprisingly high level of elastic anisotropy - therefore, its elastic properties are contingent on direction.
In this new study the researchers present simulations of how seismic waves are reproduced in iron under the conditions that prevail in the core of the earth, showing a difference of about 12 percent depending on their direction, which suffices as an explanation for the puzzling observations.
First the trajectories of movement were calculated for several million atoms in strong interaction with each other. On this basis, the scientists were then able to determine that the progress of the sound waves was actually accurately described in the computer-generated model for iron under the conditions prevailing in the core of the earth.
“We found that the body-centered cubic structure of iron is the only structure that could correspond to the experimental observations,” says Börje Johansson, professor of condensed-matter theory at Uppsala University.
The earth’s heat balance, like its magnetic field, is dependent on the amount of heat that is stored in the inner core of the earth. These conditions, in turn, are dependent on the crystal structure of the iron in the inner core. Previously these estimates were based on models deriving from the hexagonal structure of iron in the inner core. The Swedish scientists’ discovery will now entail a critical revaluation of the cooling off of the earth and of the stability of its magnetic field.
“This study opens new perspectives for our understanding of the earth’s past, present, and future,” says Natalia Skorodumova, a researcher at the Department of Physics and Materials Science.
In their studies these researchers have used models based on the so-called density-functional theory for which Walter Kohn was awarded the 1999 Nobel Prize. The calculations were carried out using the most powerful parallel supercomputers in existence, in Stockholm and Linköping.
The body-centered cubic crystal structure forms a cube with atoms in each corner and a further atom in the middle of this cube. It is oriented in such a way that its great diagonal is directed along the earth’s axis of rotation, which makes it possible for the iron to evince sound propagations with the velocities observed.
Article: Anatoly B. Belonoshko, Natalia V. Skorodumova, Anders Rosengren, Börje Johansson, Elastic Anisotropy of Earth's Inner Core, Science 8 February 2008: Vol. 319. no. 5864, pp. 797 - 800 DOI: 10.1126/science.1150302